Through the body is thermally neutral, it does not mean that there is a constant or equal thermo-equilibrium all over the body. There is a problem about the definition of the term "comfort" and the relationship between the thermal sensation and the affective estimate.
The human body is a thermal machine, immersed in air. In this paper, the thermoregulation of the body is presented and explained. Due to its thermoregulation, the body ensures its independent activity, regardless the outer temperatures. That system is quite complex, performant and reactive with a great adaptabitily.
To be valid and efficient, the modelisation of that system has to integrate all those exceptionnal characteristics.
Thermal comfort is a concept quite complex that uses various phenomena, so the methods chosen for its evaluation are different according to the aspects one is interested in. The objective of this paper is not to make an exhaustive review of the exisiting methods but to show advantages and drawbacks of the various approaches. The tools used for evaluation are very often the same as those chosen for investigation and research.
Temperatures in buildings with low and high thermal mass levels have been monitored during the warm period in Kenya. The effect of thermal mass in lowering the maximum indoor daytime temperatures has been evaluated as very effective.
The purpose of the current study is to compare experimental thermal comfort results with those predicted by the Fanger model. In making this comparison, the uncertainty of the data will be considered along with the uncertainty of the Fanger model predictions based on the uncertainty of the model input parameters. A primary outcome of the study will be a better understanding of the uncertainty associated with thermal comfort predictions. A qualitative comparison illustrates that the Fanger model can predict the experimental results for many of the cases.
This paper presents the main findings of Project HIT.2000.25 supported by the Scientific Research Foundation of Harbin Institute of Technology, a field study of indoor climates and occupant comfort in 66 residential buildings in Harbin, located in northeastern China.
Fountain and Huizenga (1995) conducted a comprehensive literature review of thermal comfort models. Significant advances in thermal comfort modeling have been achieved since that review. The present paper summarizes the advances in thermal comfort modeling for both building and vehicle HVAC applications that have occurred since Fountain and Huizengas literature review. This paper is intended to describe the potential use of these models and to demonstrate their suitability for predicting comfort during complex transient and non-uniform environmental conditions.
This paper focuses on the mathematical modeling of dynamic human thermal comfort under highly transient conditions for automotive applications. A combined physiological and psychological modeling approach was taken. First, the transient environmental and human activity data, plus the
clothing insulation data, were used as inputs to a human thermal model to determine the physiological responses for the vehicle thermal environmental conditions. Secondly, a series
This paper focuses on the experimental research of developing models to effectively predict the dynamic whole body and local thermal comfort under highly transient conditions. Two approaches were taken subsequently. The first step was to collect environmental data with a testing vehicle under transient and non-uniform conditions. An environmental chamber was used to simulate 16 typical winter and summer conditions, which fully covered the range of thermal conditions necessary
Natural convection, which arises around an occupant by his own metabolic heat, plays an important role in convection heat dissipation of the body in a room environment. The present research aimed at to know how local airflow penetrates through the natural convection layer, how it is perceived at a body surface, and finally causes sensations of warmth and air motion. As a basic study of it, horizontal local airflow was directed at the representative two locations on subjects surfaces, which are the back of the neck and the left side of the ankle.
Login